//package 草稿;
//
//public class Person {
//	private String name = "Person";
//	int age = 0;
//}
//
////The public type Person must be defined in its own file-->去掉public；改为内部类
//
//public class Child extends Person {
//	public String grade;
//
//	public static void main(String[] args) {
//		Person p = new Child();
//		System.out.println(p.name);
//		//The field Person.name is not visible-->protected or public String name= "Person";
//	}
//}

